diff --git a/admin_document_template_details.php b/admin_document_template_details.php
index 48911b3e..ad859d0c 100644
--- a/admin_document_template_details.php
+++ b/admin_document_template_details.php
@@ -7,6 +7,7 @@ require_once "includes/inc_all_admin.php";
 require "plugins/htmlpurifier/HTMLPurifier.standalone.php";
 
 $purifier_config = HTMLPurifier_Config::createDefault();
+$purifier_config->set('Cache.DefinitionImpl', null); // Disable cache by setting a non-existent directory or an invalid one
 $purifier_config->set('URI.AllowedSchemes', ['data' => true, 'src' => true, 'http' => true, 'https' => true]);
 $purifier = new HTMLPurifier($purifier_config);
 
diff --git a/admin_mail_queue_message_view.php b/admin_mail_queue_message_view.php
index 3fa05286..2204a2d0 100644
--- a/admin_mail_queue_message_view.php
+++ b/admin_mail_queue_message_view.php
@@ -6,6 +6,7 @@ require_once "includes/inc_all_admin.php";
 require "plugins/htmlpurifier/HTMLPurifier.standalone.php";
 
 $purifier_config = HTMLPurifier_Config::createDefault();
+$purifier_config->set('Cache.DefinitionImpl', null); // Disable cache by setting a non-existent directory or an invalid one
 $purifier_config->set('URI.AllowedSchemes', ['data' => true, 'src' => true, 'http' => true, 'https' => true]);
 $purifier = new HTMLPurifier($purifier_config);
 
diff --git a/admin_ticket_template_details.php b/admin_ticket_template_details.php
index dfb7e246..2a6d5c8c 100644
--- a/admin_ticket_template_details.php
+++ b/admin_ticket_template_details.php
@@ -7,6 +7,7 @@ require_once "includes/inc_all_admin.php";
 require "plugins/htmlpurifier/HTMLPurifier.standalone.php";
 
 $purifier_config = HTMLPurifier_Config::createDefault();
+$purifier_config->set('Cache.DefinitionImpl', null); // Disable cache by setting a non-existent directory or an invalid one
 $purifier_config->set('URI.AllowedSchemes', ['data' => true, 'src' => true, 'http' => true, 'https' => true]);
 $purifier = new HTMLPurifier($purifier_config);
 
diff --git a/client_document_details.php b/client_document_details.php
index f44b8e80..28f88bd1 100644
--- a/client_document_details.php
+++ b/client_document_details.php
@@ -7,6 +7,7 @@ require_once "includes/inc_all_client.php";
 require "plugins/htmlpurifier/HTMLPurifier.standalone.php";
 
 $purifier_config = HTMLPurifier_Config::createDefault();
+$purifier_config->set('Cache.DefinitionImpl', null); // Disable cache by setting a non-existent directory or an invalid one
 $purifier_config->set('URI.AllowedSchemes', ['data' => true, 'src' => true, 'http' => true, 'https' => true]);
 $purifier = new HTMLPurifier($purifier_config);
 
diff --git a/ticket.php b/ticket.php
index c7e397e1..674a0add 100644
--- a/ticket.php
+++ b/ticket.php
@@ -14,6 +14,7 @@ enforceUserPermission('module_support');
 require "plugins/htmlpurifier/HTMLPurifier.standalone.php";
 
 $purifier_config = HTMLPurifier_Config::createDefault();
+$purifier_config->set('Cache.DefinitionImpl', null); // Disable cache by setting a non-existent directory or an invalid one
 $purifier_config->set('URI.AllowedSchemes', ['data' => true, 'src' => true, 'http' => true, 'https' => true]);
 $purifier = new HTMLPurifier($purifier_config);